When creating a continuous fillet weld, you need to select two sets of faces being welded, the size of weld and the contour type (flush, convex, concave). The result will be a weld between the surfaces of the specified sets of faces, whose size will correspond to the defined size of weld. The number of faces in the sets doesn't have to match. The selected faces must belong to one or two bodies
The leg of weld is counted from the line of faces' intersection (see the figures). The convexity parameter is specified as the maximum deviation of the curved face line of the weld from the straight line. A positive deviation value results in convex weld, whereas negative – concave. Zero value corresponds to the “Flush” contour.